NOAA GREAT LAKES SEMINAR SERIES|
Wednesday, November 12, 2003
"Oxygen Concentration and Demand in Lake Erie Sediments"
Dr. Gerald Matisoff
Department of Geological Sciences, Case Western Reserve University
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105
The Great Lakes Water Quality Agreement (GLWQA) specifically targets phosphorus load reductions to achieve the elimination of seasonal anoxia in the hypolimnion of the Central Basin of Lake Erie. This has led to regular ship-board monitoring of oxygen in the hypolimnion of the Lake to monitor the status of the lake and determine if the water quality is meeting the terms of the GLWQA. However, lake-wide monitoring is expensive and there is even a difference of opinion on whether dissolved oxygen depletion rate is a good indicator of the condition of Lake Erie. One the most poorly known components of the Lake Erie oxygen budget is the sediment-oxygen demand (SOD). This work compares EPA’s data with three different methods for determining SOD: monitoring of oxygen in the water column of incubated cores, vertical oxygen concentration profiles measured by micro-oxygen electrode, and computer biogeochemical modeling. The SOD is the flux of oxygen across the sediment-water interface and is calculated from the oxygen gradient across the sediment-water interface. This work addresses temporal and spatial variations in sediment oxygen concentration and demand in Lake Erie during the summer of 2002 and August 2003.
For more information, contact:
Dr. Rochelle Sturtevant
Sea Grant Extension Agent
David F. Reid, Ph.D. U.S. Department of Commerce National Oceanic and Atmospheric Administration Great Lakes Environmental Research Laboratory 2205 Commonwealth Blvd. Ann Arbor, MI 48105-2945 Voice: 734-741-2019 FAX: 743-741-2055 GLERL home page: http://www.glerl.noaa.gov